J. Anim Sci.
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J. Anim Sci. 1983. 57:146-149.
© 1983 American Society of Animal Science
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Comparison of Intrauterine and Subcutaneous Sites of Estrogen Injection for Luteal Maintenance in Swine1

M. J. Saunders, L. A. Edgerton, J. M. Kagan, T. S. Stahly and G. L. Cromwell

University of Kentucky2, Lexington 40546-0215

Abstract

Intrauterine and subcutaneous sites for estradiol benzoate (EB) injection were compared in 30 gilts to test their relative effectiveness for estrogen-induced maintenance of corpora lutea. Vehicle or EB was injected on d 10 through 14 of the estrous cycle and corpora lutea that were maintained through d 24 were regressed subsequently by exogenous prostaglandin F2{alpha} (10 mg). Cycle length (days) was not altered in either subcutaneous (18.6 ± .5) or intrauterine (19.8 ± .8) control groups. Gilts receiving 10 mg EB/d sc had longer (P<.05) cycles (28.6 ± 2 d) than gilts treated with 100 /µg EB at either the sc (24.2 ± 1 d) or intrauterine sites (23.3 ± 1.3 d). The latter two cycle lengths were longer (P<.05) than control cycles, but not different from each other. Before d 24, progesterone concentrations (ng/ml serum) were greater (P<.01) in EB-treated gilts (25.1 ± 2.0) than in controls (13.0 ± 2.7). Progesterone concentration patterns were similar between gilts treated at intrauterine or sc sites. Thus, EB-induced maintenance of corpora lutea was not enhanced by direct injection into the uterine lumen.

Footnotes

1 The investigation reported in this paper (No. 80-5-76) is in connection with a project of the Kentucky Agr. Exp. Sta. and is published with the approval of the director. The authors express thanks to Dr. R. G. Loy, Dept. of Vet. Sci., Univ. of Kentucky, for the anti-progesterone sera and to the Upjohn Co., which provided prostaglandin F2{alpha}.

2 Dept. of Anim. Sci.






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Copyright © 1983 by the American Society of Animal Science.